1557112523 has 4 divisors (see below), whose sum is σ = 1557191640. Its totient is φ = 1557033408.

The previous prime is 1557112519. The next prime is 1557112537. The reversal of 1557112523 is 3252117551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3252117551 = 1433 ⋅2269447.

It is a cyclic number.

It is not a de Polignac number, because 1557112523 - 2² = 1557112519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1557112523.

It is not an unprimeable number, because it can be changed into a prime (1557112553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15611 + ... + 57947.

It is an arithmetic number, because the mean of its divisors is an integer number (389297910).

Almost surely, 2^1557112523 is an apocalyptic number.

1557112523 is a deficient number, since it is larger than the sum of its proper divisors (79117).

1557112523 is an equidigital number, since it uses as much as digits as its factorization.

1557112523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79116.

The product of its digits is 10500, while the sum is 32.

The square root of 1557112523 is about 39460.2651156831. The cubic root of 1557112523 is about 1159.0619951289.

The spelling of 1557112523 in words is "one billion, five hundred fifty-seven million, one hundred twelve thousand, five hundred twenty-three".